theberath



J. C, THEBERATH. APPARATUS FOR BENDTNG TUBES AND THE. LIKE.

Patented BT11111919.

2 SHEETS-SHEET l..

APPLICATION FILED IAN. 28T 191.8.

J. C. THEBERATH. APPARATUS FOR BENDING 'TUBES AND THE LIKE.l

APPLICATION' FILED JAN. 28. ISIS.

1,324,940. A Patented Dec. 16, 19.121

2 SHEETS-SHEET 2.

JOSEPH o. E LHEBHHATHQOF LAKEWOOD, OHIO, AssIGNoR rO'rHE STANDAR COMPANY, or cL-nvnLAND, OH1O,j A CORPORATION or OHIO.

-APPARATUSron' BENDING 'runns AND THE LIKE.

Application fied January 2e,- A191e. l vserial No. 214,190.

i To all whom t may concern;

Be it known vthat I, VJOSEPH C. THEBEni-xm,

a citizen of the Unitedv States, residing at` Lakewood, in the county ofl Cuyahoga and 5 State of Ohio, have v'invented a ,certain new 'and usefullmprovement in Apparatus vfor.

Bending Tubes and the'like,.-of which-the, following is a full, clear and exact ldescription, reference being had tof'the accompanying drawings. 'A

This invention relates to apparatus for-- 1 'bending tubes' and' similar articles, the objects'being `to, provide comparativelyisimple apparatus of this character that is convenient 15 of use and readily adjustable to adapt it to the bending oftubes or the like'of various sizes andon different radii; that imparts to -i Y the tube asmooth, even bend of the desired curvatureiwithout aifecting,..in" anyway, the circumferential contour of the tube; and to provide a sectional internal formV or mandrel i which effectivelycontributes tothe attain- Y mentof this 'last result, 'and which may-be easily placed within and remoyed from the V ining it against. distortion in a transverse direction; andtlus gives rise to a furtherl purpose of the .invention,'that` of' making v the drawing dieofjan expanding nature and providing means` for contracting it, preferably constituting the same means as is sub.

sequently used to move 4theddie through its curved course, so that the die closing operay tion is made dependent upon the bending peration and is therefore rendered auto- 4'0 matic; v l

Thesey several objects are attained in the construction illustrated in the drawings accompanying and forming a part hereof, and

wherein Figure 1 is an elevation ofthe apparatus, shown as containing a tube and withvthe drawing die contracted preparatory to ,bending the same; Fig. 2 is a section on the center-line of the tube in a plane parallel to that of Fig. 1, showing the parts at the completion of the bending operation; Fig. 3

is a right hand elevation of the apparatus; Fis. and 5 are sections on the lines 4-4 an \5`5, respectively, ofV Fig. 1; Fig. '6 is a perspective View of the sectional mandrel;

vertically Amoved within the holder 2 by a screw 7, equipped at its/outer end with a hand wheel 8 and havingits inner end at- .tac'hed to the jaw 'by a connection of a swivel nature and designated -9 (Fig' 2)..

D Infrare-v d Fig. 7 is a' similar 4view yof the drawing 1e..A j Describing the invention by theu'se Qf refv erence numerals, 1 isabed plate whereon opposed holders 2 and 3 'are permanently A"lfluounted, to receive, respectively,` theV refrnovable clamping jaws land 5.- The latter v' Jaw may be secured within the holder 3 v by y set screws 6, while the jaw 4 is adapted to be y f stciecation ofltettersratnt. Patented Dee. 16, 19319. l

bed plate, eXtends between the jaws lLand 5 and has attached to its end one-'section of a mandrel 15, hereinbefore referred t0. A collar 16 is adjustable along the rod 13 and is adapted tobe secured to the rod at any desired position by a. set screw 17.

A form 20, shown as circular, and as having a circumferential groove 21, is of a radius equal to that of the bend that is to be imparted to the tube, and is mounted upon a stud 22 thatxmay be attached to the bed plate in any one of a lnumber of positions, .indicated by -the circular, .stud-confining compartments of a slot 23. The form is c'ut away at 25 to produce a surface 26 ,against which a drawing die 27 may be secured, as-

by screws 28,l in a substantially radial position with respect to the stud 22 or center whereon the form 20 rotates. The drawingdie 27 -is rendered expansible by being cony structed of two parts divided onsubstantially the center line of the die opening, and

guides are provided by dowels 30 for main,-I

taining the two. parts in proper relation to l each other. A pair of plates 35 are arranged .on opposite sides of. the form 20 and die 27 and are pivoted upon the stud 22, these plates being sho-wn as secured against rotation with respect to the form, by a pin 36 which passes through the form and plates. An operating handle 38 is pivoted at 39 between the plates 35 and beyond the outer end of the die 27, and its inner endis inclined, asy shown at 40, for cooperation with the correspondingly inclined outer end of the die, for a purpose which will be presently explained. A'bending roller 42 is journaled upon an arbor 43, adj ustably carried by the opposed plates 35, the roller 42 having a. groove corresponding in ,concavity to that of the groove olf form 20. The'jaw 5 has an extension 5a which projects well into the groove of the form 2() to thoroughly support the tube.

The sectional mandrel l5 is shown in perspective in Fig. (i, and the adjacent ends ot the sections 152l and 15b thereof comprise series of interengaging tongues. The sections may be conveniently toi-med of laminations that Vare secured together by any suitable means, thc alternate laminations of each section extending, at one cud, a material distance beyond the others, thereby to form the aforesaid tongues. On one side, the tongues are curved to define an arc described from the center of the form 20 when the sections of the mandrel are swung into the angular relation to each other which corresponds to the angular relation between the ends of the tube after it has been given the desired bend. A collar 45 is adapted to be secured,

vby a set screw 4G, to the section 15b of the mandrel, to determine the extent to which it may be inserted into the tube, and in 0perative relation to the other section. A Vstop 48, carried by the bed plate, limits the movement of the plates in one direction, and a stop 49, which may be set at various 'positions upon the bed plate, arrests movement of the plates in the other direction.

In considering the operation of the apparatus it will be assumed that the jaws 4 and 5 have been separated through the instrumentality of the hand wheel S, and that the operating handle has been swung to its extreme left hand position (indicated iny dot-anddash lines in Fig. l) with the plates 35 in the position determined by the stop pin 48. past the roller 42, through the die27, between the jaws 4 and 5, and over the mandrel section 15a until the end of the tube engages and is stopped by the collar 16. The

adjustment of this collar determines the point at which the tubeyis to be bent. The hand wheel 8 may now be rotated ,to drive the screw 7 inward and move the jaw 4 into clamping relation with the jaw 5. with the tube irmly held between them.. The mandrel section 15b is now inserted in the outer end of the Atube a distance dependent upon the location of its collar 45 which 'is so arranged as to bring the interengaging fingers of the mandrel sections into proper relation as hereinbefore explained. The ends of the lingers of each section are tapered to facilitate entrance between the fingers of the other. f

The initial movement of the lever 3S toward the right will cause its inner end to The tube 12 may now be inserted operate upon the outer member of the die 27 and cam said member inward so as to contract the die to normal size. Further movement ot the handle 3S in the same direction will carry with it the plates 35, the roller 42 and the form 20, as well as the drawing die 27, with the result that the tube will be bent to an extent dependent upon the location of the adjustable pin 49. lVith the tube so bent, the mandrel section 15b may be withdrawn from the end of the tube and the parts controlled by the handle 5S returned to their v"former position, after which the jaws may be separated, and the tube withdrawn.

To adapt the apparatus to the bending -of tubes of other sizes. yit is obvious that jaws, forms, and bending rollers, having grooves corresponding in radii to those of the tubes that vare to be bent, may be substituted for the present ones; and to obtain bends of different radii, forms ot corresponding sizes are employed, and the stud 22 and arbor 43 adjusted accordingly. The angularity of the bend is determined by the position of the stop 49; and the curvature of the mandrel joint depends upon this angle and the radius of the bend. Having thus described my invention what I claim is l. In combination, holding means for a j tube or the like, a circular drawing die exdie, said die and member having cooperating parts through which the die is contracted by the initial movementI of the member.

4. In combination, holding means tor a tube or the like. a movable torni, a circular drawing die carried by the form and eX? tending around the tube, and means for moving the form.

5. In combination, holding means for an article such as a tube orthe like. a form supported in operative, relation thereto, a drawing die extending completely around the .article and movable to bend the article about the Jform, and means for so moving the die.

G. In combination. holdingv means for an article such as a tube or the like, a form movably supported in operative relation thereto, a drawing die carried by the form and extending completely around the article,

a member movableiW-ith the form, and a roller carried .by the .member`v for initiating l the bending of the article.

7. In combination, holding means Vfor an and a lever pivoted to the fram'e for moving theizsame and having a portionforjc'operation with-the' die for contracting vit.

.8. In combination, va bedv plate, holding' means for 'an article such as a tube-0r the like Supported by the bed plate, pivot means adapted to be earriedby the bed plate at A'different distances :ro'mthe holding means,.

'pivot means.

signature.

a form rotatablypand detachably supported vby said pivot means whereby forms of various radiimay be employed, al member4 for rotating said form, and means carried by said member for bending an article about the form and adjustable toward and from the 19. A mandrel comprising sections having longitudinally lapped lingers designed to present an uninterrupted or continuously ycurved supporting surface when said sections bear a.

other.

given angular relation to each- In testimony whereof, I hereunto-aliix'iny JOSEPH' o. TIiEBERA-qrn. 

